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We present time-resolved spectroscopic and polarimetric observations of theAM Her system EU Cnc. EU Cnc is located near the core of the old open clusterMessier 67; new proper motion measurements indicate that EU Cnc is indeed amember of the star cluster, this system therefore is useful to constrain theformation and evolution of magnetic cataclysmic variables. The spectra exhibittwo-component emission features with independent radial velocity variations aswell as time-variable cyclotron emission indicating a magnetic field strengthof 41 MG. The period of the radial velocity and cyclotron hump variations areconsistent with the previously-known photometric period, and the spectroscopicflux variations are consistent in amplitude with previous photometric amplitudemeasurements. The secondary star is also detected in the spectrum. We alsopresent polarimetric imaging measurements of EU Cnc that show a clear detectionof polarization, and the degree of polarization drops below our detectionthreshold at phases when the cyclotron emission features are fading or notevident. The combined data are all consistent with the interpretation that EUCnc is a low-state polar in the cluster Messier 67. The mass function of thesystem gives an estimate of the accretor mass of M_WD >= 0.68 M_sun with M_WD ~0.83 M_sun for an average inclination. We are thus able to place a lower limiton the progenitor mass of the accreting WD of >= 1.43 M_sun.

Time-resolved Spectroscopy of the Polar EU Cancri in the Open Cluster Messier 67